Anna V Song1, Bonnie L Halpern-Felsher. 1. Division of Adolescent Medicine, Department of Pediatrics, University of California-San Francisco, 3333 California Street 245, San Francisco, CA 94118, USA. anna.song@ucmerced.edu
Abstract
OBJECTIVES: To (1) identify the temporal order between oral and vaginal sex onset; (2) test whether oral sex or vaginal sex is a risk or protective factor for the other; and (3) determine whether the relationship between oral and vaginal sex varies across time. DESIGN: Prospective, longitudinal study with 6-month assessments conducted between 2002 and 2005. SETTING: Self-administered surveys completed during class time. PARTICIPANTS: At baseline, 627 ninth grade high school students from 2 northern California schools were included in the study. MAIN OUTCOME MEASURE: Oral and vaginal sex onset. RESULTS: Among sexually active adolescents, most initiated vaginal sex after or within the same 6-month period of oral sex initiation. Adolescents who initiated oral sex at the end of ninth grade had a 50% chance of initiating vaginal sex by the end of 11th grade. In comparison, adolescents who delayed until the end of 11th grade had a 16% chance of initiating vaginal sex by the end of 11th grade. CONCLUSIONS: The first 2 years of high school may be a critical age period for adolescents' vulnerability to vaginal sex initiation via oral sex behaviors. Comprehensive evidenced-based interventions and provision of preventive services aimed toward reducing sexual risk should be expanded to include the role oral sex plays in adolescent sex behavior.
OBJECTIVES: To (1) identify the temporal order between oral and vaginal sex onset; (2) test whether oral sex or vaginal sex is a risk or protective factor for the other; and (3) determine whether the relationship between oral and vaginal sex varies across time. DESIGN: Prospective, longitudinal study with 6-month assessments conducted between 2002 and 2005. SETTING: Self-administered surveys completed during class time. PARTICIPANTS: At baseline, 627 ninth grade high school students from 2 northern California schools were included in the study. MAIN OUTCOME MEASURE: Oral and vaginal sex onset. RESULTS: Among sexually active adolescents, most initiated vaginal sex after or within the same 6-month period of oral sex initiation. Adolescents who initiated oral sex at the end of ninth grade had a 50% chance of initiating vaginal sex by the end of 11th grade. In comparison, adolescents who delayed until the end of 11th grade had a 16% chance of initiating vaginal sex by the end of 11th grade. CONCLUSIONS: The first 2 years of high school may be a critical age period for adolescents' vulnerability to vaginal sex initiation via oral sex behaviors. Comprehensive evidenced-based interventions and provision of preventive services aimed toward reducing sexual risk should be expanded to include the role oral sex plays in adolescent sex behavior.
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